z4 with m suspension

rsutoratosu · 07-15-2021, 11:48 AM

Got a question, the z4 with m suspesion, on bilsteins site, the search says to use the b8 because its lowered. B8 is stiffer correct ? is there any other solution to a softer ride ?

I guess the other option would be replace the front & back with b4 and get regular springs and swap out the M lowering springs ?

Spec-Al · 07-15-2021, 04:52 PM

I replaced my blown m-sport shocks with Bilstein B8. The ride was noticeably better afterwards.

Our03z4 · 07-15-2021, 08:33 PM

I have the Msport suspension and replaced my shocks and struts with B4s, kept the original springs but upgraded all the other suspension parts. Huge difference in ride and handling.

rsutoratosu · 07-16-2021, 05:03 PM

Did your ride height change with b4 ?

SunUpTopDown3 · 07-19-2021, 06:24 PM

Yes B8 is valved for lowering springs, they are marketed as Sports shocks for lowering springs. They are firmer/stiffer than factory. There is also B6 which are also sport shocks and are the same firmness/stiffness as B8 but these are valved for OE springs/ride height.

B4 are touring and are marketed as direct stock/factory replacemnet. But significantly improved damping and control than factory (not necessarily stiffer)

Shocks dont usually change ride height, springs do.

rsutoratosu · 07-19-2021, 09:17 PM

Some guy at the other site says getting b4 for his m suspension raised the car.. he had to return it and get b8. So i was just confirming that..

07-15-2021, 11:48 AM	#1
rsutoratosu Captain 114 Rep 779 Posts Drives: Z4 3.0i Join Date: Mar 2011 Location: Chicago, IL iTrader: (0)	z4 with m suspension Got a question, the z4 with m suspesion, on bilsteins site, the search says to use the b8 because its lowered. B8 is stiffer correct ? is there any other solution to a softer ride ? I guess the other option would be replace the front & back with b4 and get regular springs and swap out the M lowering springs ? __________________ -Roranji
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07-15-2021, 04:52 PM	#2
Spec-Al Enlisted Member 4 Rep 35 Posts Drives: bmw Join Date: Mar 2011 Location: us iTrader: (0)	I replaced my blown m-sport shocks with Bilstein B8. The ride was noticeably better afterwards.
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07-15-2021, 08:33 PM	#3
Our03z4 Captain 1692 Rep 685 Posts Drives: 2008 BMW Z4 3.0si Coupe, Join Date: Nov 2016 Location: USA iTrader: (0)	I have the Msport suspension and replaced my shocks and struts with B4s, kept the original springs but upgraded all the other suspension parts. Huge difference in ride and handling.
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07-16-2021, 05:03 PM	#4
rsutoratosu Captain 114 Rep 779 Posts Drives: Z4 3.0i Join Date: Mar 2011 Location: Chicago, IL iTrader: (0)	Did your ride height change with b4 ? __________________ -Roranji
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07-19-2021, 06:24 PM	#5
SunUpTopDown3 Backroad Warrior 64 Rep 112 Posts Drives: Z4MR Join Date: Jan 2020 Location: STL iTrader: (0) Garage List 2017 Volkswagen GTI [0.00] 2007 BMW Z4MR [0.00]	Yes B8 is valved for lowering springs, they are marketed as Sports shocks for lowering springs. They are firmer/stiffer than factory. There is also B6 which are also sport shocks and are the same firmness/stiffness as B8 but these are valved for OE springs/ride height. B4 are touring and are marketed as direct stock/factory replacemnet. But significantly improved damping and control than factory (not necessarily stiffer) Shocks dont usually change ride height, springs do. __________________
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07-19-2021, 09:17 PM	#6
rsutoratosu Captain 114 Rep 779 Posts Drives: Z4 3.0i Join Date: Mar 2011 Location: Chicago, IL iTrader: (0)	Some guy at the other site says getting b4 for his m suspension raised the car.. he had to return it and get b8. So i was just confirming that.. __________________ -Roranji
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